Sewing machine work trimmer



H. J. LE VIESCONTE 2,138,765

SEWING MACHINE WORK TRIMMER Nov. 29, 1938.

Filed Sept. 9, 1956 9 Sheets-Sheet 1 FIG. I-

Harold J? LWsconte,

TORNEYS. I

Nov. 29, 1938. H, LE VESCONTE 2,138,765

SEWING MACHINE WORK TRIMMER Filed Sept. 9, 1936 9 Sheets-Sheet 2 1 FIG. I. 1/

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TORNEYS.

Nov. 29, 1938.

H. J. LE VESCONTE 2,138,765

SEWING MACHINE WORK TRIMMER Filed Sept. 9, 1936 9 Sheets-Sheet 4 F IG- XI'I By I If! I TORNEYS.

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Nov. 29, 1938. H J VESCONTE 2,138,765

SEWING MACHINE WORK TRIMMER Filed Sept. 9, 1936 9 Sheets-Sheet J Elllill m FIG iv- Ky /W WITNESSES: TOR:

M Harold J Lwascon'te,

NOV. 29, 1938. H LE VESCONTE 2,138,765

SEWING MACHINE WORK TRIMMER Filed Sept. 9, 1956 9 Sheets-Sheet 8 ii .i

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M Harold JLeVeswnZe,

BY /I u/Wm NOV. 1938- H. J. LE VESCONTE SEWING MACHINE WORK TRIMMER FiledSept. 9, 1936 9 Sheets-Sheet 9 INVENTOR- Hizrloi JLMswnZe,

UNITED STATES PATENT OFFICE SEWING MACHINE WORK IRIMIMER Harold J. Le Vcsconte,

Western Springs, 111., as-

signor to Union Special Machine Company, Chicago, 111., a. corporation of Illinois Application September 19 Claims.

This invention relates to work feeding and cutting devices for sewing machines and the like, and especially rotary devices. The invention is very advantageous for the type of work-trimming generally known as pinking, in which a recurrent-patterned or scalloped edge is produced adjacent a seam. In suitable forms of embodiment, such as hereinafter described, the invention obviates difilculties in installing the devices employed to the right of and directly opposite the needle, beneath the work support, even in lock-stitch machines; afiords unitary mechanisms that can easily be installed on existing machines; and permits of readily putting the cutting means out of action when it is desired to use the machine for ordinary sewing, without trimming. Other features and advantages of the invention will appear from the following description of species or forms of embodiment thereof, and from the drawings.

In the drawings, Fig. I is a side view of a lockstitch type of sewing machine conveniently embodying my invention, the main frame of the machine and certain other partsbeing in vertical section.

Fig. II is aview from the left of Fig. I with a cover plate removed to show the mechanism in the needle-head, and with the work support and associated parts mainly in cross-section as indicated by the line and arrows IIII in Fig. I.

Fig. III is a bottom plan view of the work support and associated parts, with the lower portion of a gear casing cut away and removed.

Fig. IV is a plan view of a supporting bracket for an upper pinking device and the associated parts, detached from the needle-head of the machine.

Fig. V is a fragmentary view similar to a portion of Fig. I, but showing a different arrangement of pinking devices;

Fig. VI is a side view of a work feed device and associated parts, taken as indicated by the line and arrows VI-VI in Fig. III. I

Fig. VII is a similar view illustrating driving mechanism for the feed, taken as indicated by the line and arrows VII-VII in Fig. III.

Fig. VIII shows a longitudinal sectional view through the rotary hook mechanism of the machine, taken as indicated by the line and arrows VIII-VIII in Fig. III.

Fig. IX shows a section at right angles to Fig. VIII, taken as indicated by the line and arrows IXIX in Fig. III.

Fig. X is a plan view of the rotary hook mechanism, with associated structure in horizontal 9, 1936, Serial No. 99,919 (01. 112-124) section as indicated by the line and arrows X-X in Fig. I.

Fig. XI is a fragmentary side view illustrating a modified construction of the upper pinking unit, with the needle-bar and needle, the presser-foot, a portion of the needle-head, the work-support, and the lower pinking unit, the casing of the latter being shown in section.

Fig. XII is a similar view at right angles to Fig. XI.

Fig. XIII is a rear side elevation of the machine equipped with the upper pinking-unit .of Figs. XI and XII.

Fig. XIV is a fragmentary plan view partly in horizontal section as indicated by the line and arrows XIVXIV in Fig. In, illustrating some of the parts of the upper pinking unit shown in Figs. XI, XII, and XIII.

Fig. XV is a view similar to Fig. I illustrating a lock-stitch machine having a needle feed and equipped with my pinking devices. I

Fig. XVI shows the needle head and associated parts of the Fig. XV machine, with the main frame in vertical longitudinal section.

Fig. XVII is a view from the left of Fig. XV with a cover plate removed to show the mechanism in the needle-head.

Fig. XVIII is a fragmentary plan view of an operating connection which appears in side ele-' vation in Fig. XVI.

As shown in Figs. 1, II, and III, the frame of the sewing machine here illustrated includes a bed l6 carrying a work support H at its left-hand end and an upright hollow standard I 8 at its right-hand end, with a horizontally projecting hollow arm l9 that carries a needle head over the work support I'l. With the head 20 are associated a vertically reciprocating needle bar 2| carrying a needle 22, and a spring actuated presser bar 23 carrying a presser foot 24. The presser bar 23 is mounted in the head 20 so as to be vertically movable, and is yieldingly urged downward by a helical compression spring 25, as usual. The needle bar 2| may be actuated from the horizontal main drive shaft 26 (mounted in bearings 21, 21 in the arm ill) by any suitable means, such as a counter-balanced crank 28 on the end of the shaft with a pitman connection 29 from its crank pin 30 to a pivot pin 3| suitably mounted on the needle bar. The shaft 26 may be driven from any suitable source of powerby any suitable means, here indicated by a portion of a hand and pulley wheel 32 fast on the right hand end of said shaft 26. The ,usual accessories (not here shown) may of course be provided, such as thread tension,

described in the application of Norman V. Chris-.

tensen and Oscar Quist, Serial No. 53,552, filed December 9, 1935, assigned to the assignee of this application. W'ork feeding mechanism 34 of fourmotion type is also shown beneath the work support H, for coacting therethrough as usual with the presser foot 24. To the right of the needle 22 and the presser foot 24 and feed mechanism 34 is shown work-trimming or pinking mechanism of rotary type, comprising lower and upper rotors or rolls 35 and 36, which coact with one another through the work support H. Mounted in bearings 3'1, 38 beneath the work support I! is shown a longitudinal horizontal shaft 40 from which may be driven or actuated the stitchforming mechanism 33, the work-feeding mechanism 34, and the pinking mechanism, or, as shown in Figs. I and II, the lower pinking roll 35. This shaft 46 may be driven from the shaft 26 by means of helical gears M, 42 of equal diameters on the shafts 26, 46, and an interposed coacting idle gear 43 mounted on a short intermediate shaft. As shown in Figs. I and III, the shaft 46 consists of approximately aligned sections with an interposed flexible or universal coupling 44 that takes care of slight misalignment, and permits slight adjustments of the left-hand shaft section.

As shown in Figs. I, II, and III, the pinking roll 35 is associated with an enclosed speed reduction unit. The roll 35 is mounted on the projecting end of a short shaft 45 located directly above the shaft 46 and (like it) in line with or directly opposite the needle 22, though below the top of the work support IT. The shaft 45 and the pinking roll 35 may be driven from the shaft 46 through reduction gearing enclosed in a casing 46 provided with journal bearings for the shafts 40, 45, etc, and preferably forming an oil-tight housing for the enclosed parts. The

shaft 40 carries a pinion 4? (held fast thereto bya set screw) that meshes with a gear 48 on a short shaft 43 extending parallel to the shafts 40 and 45; and the shafts 40 and 45 are interconnected through a short cross-shaft, 50 which is mounted in bearings on the casing wall and is connected to shaft-45 through coacting spiral gears 5!, 5i, and to shaft 49 through a worm 52 on shaft 46 that meshes with a worm wheel ,53 on shaft 56. The bottom of casing 46 is shown as a separate plate 54, detachably secured thereto by screws. As here shown, the casing 46 with its enclosed parts and the roll 35 constitute a lower pinking unit 55, bodily adjustable with roll 35 toward and from the needle 22 to vary the distance from the stitching. to the pinked edge.

The pinking unit 55 may be detachably secured to the work support I! by means of screws 56, 56 taking into the rear margin of the work support through slots 51, 51 in a rear flange on casing 46, and by a screw 58 (Fig. II) taking into the front wall of said casing 46 through a slot in a depending flange 60 on the work support. As shown in Figs. II and III, there is a tongue and groove engagement at 6| between the flange 66 and the tive to the bracket.

side of the casing46, to assist in definitely positioning and aligning the unit 55; and the upperportion of the casing 46 projects upward into a longitudinal opening 62 in the work support I'I, flush with its top surface The pinion 4'! is shown with a. relatively wide face, permitting e'asy' lateral shifting or adjustment of the pinking unit 55 along the shaft 40 toward and from the needle 22 by loosening up and retightening the screws 56, 56 and 58, without opening up the casing bottom 54 to get at the setscrew of pinion 41.

As already mentioned, the lower pinking roll 35 coacts through an opening in the work support I! with an idle, freely rotating upper pinking roll 36, shown in Figs. I and II as rotatably mounted on a pivot 64 at one side of a supporting arm 65 that is carried by a bracket 66 attached to the needle-head 26, these parts constituting an upper pinking unit 61. Preferably, the upper roll 36 is yieldingly pressed against the lower roll 35 in normal operation, but is arranged to be easily shifted out of coaction with said lower roll when desired, to allow ordinary sewing to be done on the machine without cutting or trimming the work.

As shown, the arm 65 has at its upper end a lug 68 by which it is pivoted between lugs 63, 69 of the bracket 66, on a pivot pin 16 removably secured in the lugs 69, 69. The hole H for pivot ill in arm-lug 66 is vertically elongated to allow up and down play or movement of the arm rela- Normally, arm 65 is yieldingly pushed downward by a fairly strong but flexible spring 12 acting on the upper flat side of a lateral shoulder 13 on arm 65, thus holding the periphery of roll 36 yieldingly pressed against that of roll 35. As shown in Fig. II, the spring 12 is a leaf-spring with one end bent upward and attached to bracket'66by screws, while its other (free) end rests against an adjustable abutment formed by a setscrew 14 in the bracket, between depending guide lugs l5, l5 thereon (Fig. II). The shoulder 13 on arm 65 engages against the mid-portion of the, spring 12, so that the initial downward pressure and the upward resistance of the spring may be adjusted by means of the setscrews l4.

The shoulder I3 is here shown as in efiect a cam eccentric upward above an axis afforded by a pivot-shank 16 extending through the arm 65 and provided with an arcuate handle-arm ll; so that by turning this handle Tl 90 either way, the shoulder cam l3 will be disengaged from spring 12, and the tension of the latter relaxed or released. This allows the arm 65 to be lifted to clear the roll 36 over the roll 35, and then swung to the right and upward 90, out of coaction with roll 35 and out of the way, as indicated in dotted lines in Fig. I. By a reversal of these movements,

' roll 36 may be returned into coaction and engagement with roll 35, as shown in full lines.

As shown in Figs. II and IV, bracket 66 is clamped to the needle head 26 by screws l6, l8 thattake into the head through slots l9, 19 in the bracket. This. affords a convenient means of adjusting the upper pinking unit 61 laterally toward and away from the needle in accordance with the adjustment of the lower pinking unit 55 as described above. g

In Figs. I, II, and III the larger positively driven lower pinking roll 35 is shown as the cutter, having a sharp zig-zag peripheral edge such as well known in the art, while the smaller idle upper roll 36 has a plain, flat periphery that coacts with thecutter 35 as an abutment. This roll 35 also acts to feed the material, as'well as the feed 34. The rolls 35, 36 may be detachably secured to the'parts which carry them, as by screws such as shown in Fig. II, to permit their easy removal and replacement. In Fig. V, an interchange of functions is illustrated, the smaller idle upper roll 36a being a zig-zag sharp-edged cutter, while the larger lower roll 35a has a plain, fiat periphery that acts as an abutment. In this case, the upper cutting roll 36a is only driven by the work as it is fed and by the coaction of the driven lower plain roll 35a. In Fig. V, other parts and features are marked with the same reference numerals as in Figs. I and II, as a means of dispensing with repetitive description.

Figs. VI and VII illustrate one type of fourmotion feed 34 which is suitable and preferred for my purpose, being readily adaptable to permit extreme closeness of both the stitch mechanism 33 and the pinking devices 35, 36 to the needle 22. This feed is that shown and described in the application of George Sauer, Serial No. 54,805, filed December 17, 1935, and assigned to the assignee of this application. It comprises a feeddog 80 adjustable up and down on a feed-bar 8| by means of a screw and slot connection 82, and coacting with the presser-foot 2 3 through an opening in a throat or stitch-plate 83 associated with the work-support II. The feed-bar 8i re' ceives up and down work-engaging motion from an eccentric 8 3 on shaft 40, through an eccentric strap and rod device 85 pivoted to the feed bar at 86, directly below the shaft. The feed-bar BI receives to and fro work-feeding movement from an oscillatory crank-arm N pivoted to the feed bar at 88, and fast to a longitudinal shaft 80 extending parallel with the shaft beneath the work support II. This shaft 90 is shown as mounted in bearings @I, IN, QI on the worksupport II. The shaft 90 may be actuated by an eccentric 92 on shaft 30, through connections comprising an eccentric strap and rod device 93 and a toggle whose links 90 and are pivoted "together and to said device $3 at 96. Toggle link 96 is anchored on a fixed pivot 97 carried by the work-support I'I, while link 05 is pivoted at 92 to a slotted crank arm I00 fixed to shaft 90. By shifting the link pivot 99 along the slotted arm I00 toward or from the shaft 90, the feed and the stitch length can be shortened or lengthened as desired.

As shown in Figs. I, III, and VIILX, the lockstitch mechanism or unit 33 is of horizontally rotating rotary hook type, comprising a rotary looptaker hook IOI whose upright axis consists of a hollow shaft I02 arranged parallel with the needle 22 and in the vertical plane of the shaft 410. The shaft I02 is journalled in a bearing bushing I 03 in'the wall of a casing I05 through which the shaft 40' extends. As shown in Fig. VIII, the rotary hook "II is removably mounted on the upper end of the hollow shaft I02, being provided with an axial stud I06 that fits free but not loosely in the shaft I02 and has a flat tongue I01 that engages in a diametral slot in a plug I08 fixed in the lower end of the shaft bore. The rotary hook IOI may be removably secured in the shaft I02 by a screw I03 extending axially through the stud I06 and taking into the plug I08. The rotary hook shaft I02 may be driven from the shaft 40 by intermeshing bevel gears I I0, I II fixed to said shafts. The gear ratio may be suchas to give two revolutions of the hook IOI for each complete reciprocation of the needle 22. As shown in Fig. VIII, the gear III isnot attached directly to the shaft 50, but to a sleeve ,3 fitting free but not loosely on the shaft 40, and journalled in a, bearing bushing I I4 in the left-hand wall of the casing I05. The outer end of the sleeve II3 forms a split-collar II5, with a screw for clamping it fast on the shaft 40. This clamping arrangement not only permits of adjusting the gear III angularly relative to the shaft 40, but also facilitates adjusting the entire rotary hook stitching unit 33-consisting of the hook IOI, casing I05, and the associated partsalong the shaft 50, laterally toward or from the needle 22. A collar II'I fixed on the sleeve II3 by a setscrew coacts with the hub of the gear, I II and the bearing bushing II4 to keep sleeve H3 and gear III in proper positions.

The casing I05 of the rotary hook unit 33 has a tongue and groove engagement BI with the work-support fiange 60, similar to that of the lower pinking unit 55, and is secured to said flange 60 by a similar clamp screw and slot arrangement at 58. Thus the unit 33 can easily be adjusted or shifted laterally along the shaft 60 toward and from the needle 22. Like the pinkingunit 55, the hook unit 33 affords journal bearing for the section of shaft :30 to the left of coupling MI. The casing I05 forms an oil-tight enclosure for the gears H0, III, and may be charged or emptied'by means of an opening with a screw-plug I60 in its bottom. The journal bearing of sleeve II3 in bushing III may be lubricated with oil supplied through a duct H9 extending down from the top of the casing I05 as shown in Fig. X. The rotary,hook IOI may be provided with the usual lockstitch accessorie such as the bobbin case I20, etc.

From the foregoing description and a consideration of Figs. I, HI, and VIII, it will be appreciated that the horizontallyrotating type of looptaker mechanism is especially advantageous in affording room for the lower pinking roll 35 and associated parts at the right of the needle 22, below the top of the work support I'I. Also, the type of feed mechanism 33 illustrated is peculiarly adapted to the combinatiomsince it takes up little room laterally at the level of the pinking roll 35 and the horizontally rotating hook IIlI. Lower down, on the other hand, the pinking and stitch units 55, 33 afford ample room between them for the lower parts of the feed mechanism 343. Both'pinking units 55, SI can be readily installed on the type of sewing machine illustrated, or removed therefrom.

Figs. XI-XIV show the machine of Figs. I-X with a modified construction of the upper pinking unit, various parts and features being marked with the same reference numerals as in Figs I-X in order to dispense with repetitive description, and a distinguishing letter being added to these numerals where such distinction appears necessary.

Corresponding to the one bracket 66 of Figs. I-VIII, the upper pinking unit 61a of Figs. XI-XIV comprises a base-bracket 66a attached to the needle-head by screws I8, I8 in slots I9, I9, and a guide-bracket 66b pivoted to said bracket 66a by a lug 680. between lugs 69a, 39a, and a pivot pin 70a. The bracket 66b affords upright dovetail g'uideways for vertical movement The spring 12a that urges arm 65a and roller 36 downward is mounted on the guide-bracket 66b. Normally, the bracket 665 (with the parts that it carries)- may be held in the full-line position of Figs XI and X11 by a spring latch device I24, comprising a yieldinglyprotruded plunger-pin I sliding in the bore of a' barrel I26 on the base-bracket 66a, and engaging in a socket-lug J21 of the guide-bracket 6611. A head I28 on the rear end of the reduced shank of the plunger I25 serves as a stop to limit the protrusion of said plunger by a helical compression spring in the barrel I26 around the reduced plunger shank, and as a handle for retracting the plunger I25 when desired. Retraction of pin I25 out of socket I21 (after release of the normal tension of spring 12a) allows the bracket 66b and the parts carried thereby to be swung to the right to an inoperative position such as shown in dotted lines in Fig. XI, where roll 36 is out of coaction with roll 35. The parts may be held in such inoperative positionby any suitable means, such as a shouldered latch spring I29 on the machine arm I9 for engaging the corner of roll 36. When this has been done, the machine will sew indefinitely without possibility of cutting or trimming the work.

Provision may be made for conveniently throwing the pinklng device in and out of action at will without stopping the machine, or even interrupting the sewing of a seam, by lifting the upper roll 36 a short distance above the lower roll 35. For this purpose, a lever I30 is fulcrumed on a lug or ear of guide-bracket 661), as by means of a shoulder-screw I3I, and-is provided with a slot I32 through which extends the pivot-shank 16 connecting shoulder-cam 13 to handle 11. The free end of lever I30 has a ball-stud pivot connection I33 to a link I34 whose upper end is pivoted to one end of a lever I35 that is fulcrumed on the machine arm I9, as by means of a shoulder-screw I36 which also serves as a fulcrum for a lever I31 of the usual presserfoot lifting mechanism. The other end of lever I35 may be suitably connected (as by a link I38) to any convenient actuating device, such as a foot-treadle or a knee-press (not shown). It will be observed from Fig. XII that when the upper roll 36 is in its depressed operative position for engaging or coacting with the lower roll 35, the ball-stud pivot I33 is in axial alignment with the hinge pivot 10a of bracket 661) on bracket 66a. Thus the connections for temporarily lifting roll 36 out of engagement with roll 35 do not. interfere at all with swinging the whole bracket 66b and the parts carried thereby to the right to render the pinking device wholly inactive. However, the latch device I24 prevents any possibility of swinging bracket 66b to the right when lever I30 is operated to lift arm 65a in the guideway of said bracket 66b.

Figs. XV-XVIII illustrate the application of my invention to a needle-feed type of lockstitchsewing machine such as illustrated in the application of George Sauer, Serial No. 55,502, filed December 21, 1935, but equipped with a horizontally rotating stitch mechanism 33 such as above described, and without the feed 34 of Figs. I-VII. In general this machine is similar to that shown in Figs. I and II, and various parts and features are marked with the same reference characters as in Figs. I and II as a means of dispensing with repetitive description.

As shown in Figs. XV, XVI, and XVII, the needle bar 2I reciprocates in a, guide bracket I40 which is pivoted on a stud I4I secured in the lower end of the head 20, and includes upper and lower guide bearings I42 and I43 for said needle ..and XVII is of roller type.

'arms I62, I62.

bar. Openings in the upper and lower ends of the head 20 afford clearance for the needle bar 2| to swing or oscillate relative to the head. As here shown, the guide bracket I40 is joscillated about-- its pivot MI from a horizontal shaft I5I mounted in bearings I52 in the arm I9, by means comprising a rocker arm or crank I54 fixed to the end of the shaft I5I. and provided with a pivot pin I55 whose flattened end I56 is slidingly engaged in a vertical slot or groove in the upper portion I42 of the bracketl40, Figs. XVI and XVIII. The shaft I5I may preferably be driven from the shaft 26 by means adapted to impart an adjustably variable oscillation to said shaft I5I.

The mechanism shown in Fig. XV for actuating shaft I5I from shaft 26 includes an eccentric application of George Sauer, Serial No. 55,502,

or by any of the well-known means for so adjusting an eccentric.

The oscillation of needle bar guide I40 as described causes a corresponding to and fro motion of needle 22 in the direction of feed. With suitable adjustment or setting of the various eccentrics and cranks, as shown, there is a movement of needle 22 in the direction of feed while engaged in the work. The driven roll 35 also acts to feed the work. The contrary movement of the needle 22 takes place while it is out of the work. The amplitude of this work-feeding movement of the needle 22 can be adjusted by adjustment of the eccentric I51 as above indicated.

In the absence of any lower feed, this combination of a needle-feed with a horizontally rotating stitch mechanism 33 allows of maximum compactness: i.'e., theestitch mechanism 33 and the pinking roll 35 'can both be set as close as desired to the needle. However, any suitable lower feed (such as the four-motion feed of Figs. I-VII) can of course be added to the combination as shown in Figs. XV-XVIII.

The presser foot I60 shown in Figs. XV, XVI, It comprises a bracket structure I6I attached to the lower end of presser'bar 23 and having laterally projecting The roller revolves on a stud I63 mounted in the lower end of a sloping arm I64 whose: uppe'r shoulder portion I65 is pivoted about a horizontal axisparallel with the line of.

feed. For this purpose, conical-ended pivotsc-rews I66, I66 in the bracket arms I62, I62 engage in corresponding sockets in the part I65 of arm I64, these screws I66, '.I66 being shown as provided with lock-nuts I61, I61. For determiningand adjusting the exact position of the roller relative to the needle 22, as well as the angular relation of its periphery tothe work support I],

' and holds arm I 64 in the position shown, with stop-screw I68 against bracket I 6|. By forcibly I swinging arm I64 to the left (Fig. XII), its shoulder I65 can be snapped past thelatch end of spring I10 and freed, so that the roller can be swung up out of the way forinsertion or removal of work beneath the presser-foot. As shown in Fig. XVI,- the tread of the beveled roller makes a very acute angle with the plane of work support l1. Having thus described my invention, I claim: 1. In a sewing machine, the combination of a bed provided with a work support at one endand,

a standard at the other end carrying an arm with a sewing head over said work support, a needle bar operating in said head and a needle carried thereby, a rotary looptaker with its axis extending in the general direction of said needle-bar at the outside of the needle from'said standard, and means for pinking the work during sewing comprising a positively driven rotary pinking cutter at the inside of the needle acting on the work from beneath through said support.

2. In a sewing machine, the combination of a bed provided with a work support at one end and a standard at the other end carrying an arm with a sewing head over said work support, a needle bar operating in said head and a needle carried thereby, a horizontally revolving looptaker below said work support at the outside of the needle from said standard, a positively driven rotary pinking cutter at the inside of the needle acting on the work from beneath through said support, and a roller above said support at the inside of the needle, yieldingly pressed against said cutter.

3. In a sewing machine, the combination of a bed provided with a work support at one end and a standard at the other end carrying an arm with a sewing head over said work support, a needle bar-operating in said head and a needle carried thereby, a looptaker at the outside of the needle from said standard, and means for pinking the work comprising a positively driven lower rotor at the inside of the needle acting on the work from beneath through said support and a freely rotating upper rotor normally yieldingly pressed against said lower rotor, but swingable toward said standard out of coaction with said lower rotor.

4. In a sewing machine, the combination of a work support, work feeding and stitch forming means including a needle bar with a needle carried thereby and a rotary looptaker with its axis extending in the general direction of said needlebar but to one 'side of the needle, and a pinkcutting device operating on the fabric at the other side of said needle and adjustable transversely of theline of feed toward and from the needle, and including means engaging the fabric from beneath through the work support.

5. In a sewing machine, thecombination of a bed provided with a work support .at one end and a standard at the other end carrying an arm with. a sewing head over saidwork support, a

driving shaft beneath said work support, a needle 7 bar operating in said head and a needle carried thereby, a rotary looptaker at the outside of the needle from said standard actuated from said shaft, a rotary pinking cutter at the inside of the needle directly above said shaft actuated therefrom and acting on the work through said support, and a. coacting roll above the work support at the inside of the needle yieldingly pressed against said cutter.

6. In a sewing machine, the combination of a bed provided with a work support at one end and a standard at the other end carrying an arm with a sewing head over said work support, a driving shaft beneath said work support, a needle bar operating in said head and a needlecarried thereby, a rotary looptaker with upright axis at the outside of the needle from'said standard actuated by said shaft, a rotary pinking cutter at the inside of the needle directly above said shaft actuated therefrom and acting on the work through said support, and a coacting roll above the work support at the inside of the needle normally yieldingly pressed against said cutter, but shiftable out of coaction therewith.

7. In a sewing machine, the combination of a bed provided with a work support at one end and a standard at the other end carrying an arm with a sewing head over said work support, a driving shaft beneath said work support, a needle bar operating in said head and a needle carried thereby, a rotary looptaker at the outside of the needle from said standard actuated by said shaft, a rotary pinking cutter at the inside of the needle directly above said shaft driven therefrom and acting on the work through said support, and a coacting roll above the work support at the inside of the needle normally yieldingly pressed against said cutter, but swingable toward said standard out of coaction with said lower rotor.

8. In a sewingmachine, the combination of a needle bar operating above the work, with a needle carried thereby, work feeding means including a feed bar extending in the direction of feed beneath the needle, a looptaker coacting with said needle and revolving horizontally at one side of the needle above said feed bar, and a pinking rotor at the other side of said needle and feed bar acting on the Work from beneath.

9. In a sewing machine, the combination of a Work support, a needle bar above said work' shaft beneath said work support, work feeding.

means including a feed bar extending in the direction of feed over said shaft, an actuator for said feed bar on said shaft beneath the feed bar, a looptaker over said shaft driven therefrom and revolving horizontally above said feed bar, and a pinking rotor at the opposite side of said feed bar from said looptaker, located over said actuator and shaft and driven from the shaft.

10. In a sewing machine, the combination of a needle bar and needle having an up and down movement and also a lateral to and fro workfeeding movement, and acting on the work from above, a looptaker at one side of the path of work-feeding needle movement, and a pinking rotor at the other side of the path of work-feeding needle movement acting on the work from beneath.

11. In a sewing machine, the combination of a needle bar and needle having an up and down movement and also a lateral to and fro workfeeding movement, and acting on the work from above, a looptaker revolving horizontally at one side of the path of work-feeding needle moveat the other side of the path of work-feeding needle movement, driven from said shaft and acting on the work from beneath.

13. In .a sewing machine, the combination of work feeding and stitch forming means including a needle bar with a needle carried thereby, and a rotary pink-cutting device for the work including a positively driven lower rotor and -a freely rotating upper rotor normally yieldingly pressed against said lower rotor, but swingable out of coaction therewith at the will of the operator.

14. In a sewing machine, the combination work feeding and stitch forming means including a needle bar with a needle carried thereby, and a rotary pink-cutting device for the work including a positively driven lower rotor and a freely rotating upper rotor normally yieldingly pressed against said lower rotor, but swingable in the vertical plane of its axis out of coaction with said lower rotor.

15. In a sewing machine, the combination of support around said shaft at one side of said needle and adjustable toward and from the latter, and having a rotary looptaker with upright axis driven from said shaft, and a pinking unit removably mounted on said work support around said shaft at the other side of said needle and adjustable toward and from the latter, and having a pinking rotor over said shaft driven from the latter and acting on the work from beneath.

16. In a sewing machine, the combination of a bed provided with awork support at one end and a standard at the other end carrying an arm with a sewing head over said work support, a driving shaft beneath said work support, 'a needle bar operating in said head and a needle carried thereby, a rotary looptaker with upright axis removably mounted on said bed at the outside of the needle from said standard and driven by said shaft, a lower pinking unit removably mounted on said bed at the inside of the needle and including a rotor directly above said shaft driven therefrom and acting on the work from beneath, and an upper pinking unit mounted on said head and including a rotor at the inside of the needle yieldingly pressed against the aforepink-cutting device at the other side of the needle, including a positively driven lower rotor acting on the work from beneath and a coacting upper rotor normally yieldingly pressed downward against said lower rotor, but swingable aside away from the needle out of coaction with said lower rotor; and means for at will temporarily raising said upper rotor from said lower rotor without interrupting the sewing of a seam by the machine.

18. A pinking attachment for sewing machines comprising a speed reduction unit including a frame structure with means for mounting it beneath the work support on a rotary hook-supporting bracket of the machine, means for driving said speed reduction unit when so mounted from a rotary shaft beneath the work support, and a shaft projecting from said unit with a rotary pinker thereon.

19. A pinking attachment for sewing machines comprising a frame and casing structure with means for mounting it beneath the work support on a. rotary hook-supporting bracket of the machine, reduction gearing mounted and enclosed in the frame and casing structure, and

' including a gear for meshing with a. gear on the hook-driving shaft of the machine, and a shaft driven by said gearing carrying a pinking rotor with its periphery exposed upward above the casing, for engaging through the work support with work thereon.

HAROLD J. LE VESCONTE. 

